/**
 * Copyright (C) 2007 The AsyncMail Group <asyncmail@googlegroups.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *         http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.asyncmail.smtpserver.handler.fastfail;

import org.apache.commons.logging.Log;
import org.springframework.beans.factory.annotation.Required;

import com.googlecode.asyncmail.common.DSNStatus;
import com.googlecode.asyncmail.common.MailAddress;
import com.googlecode.asyncmail.smtpserver.SMTPSession;
import com.googlecode.asyncmail.smtpserver.hook.HookResult;
import com.googlecode.asyncmail.smtpserver.hook.HookReturnCode;
import com.googlecode.asyncmail.smtpserver.hook.RcptHook;

/**
 * Set a minimum domainlength of the recient before accept recipient. Default is
 * lenght 4 bekause s.tk is the shortest we know.
 * 
 */
public class MinDomainLengthHandler implements RcptHook {

    private int minDomainLength = 4;

    private Log logger;

    public void setMinDomainLenght(int minDomainLength) {
        this.minDomainLength = minDomainLength;
    }

    @Required
    public void setLogger(Log logger) {
        this.logger = logger;
    }

    /**
     * @see com.googlecode.asyncmail.smtpserver.hook.RcptHook#doRcpt(com.googlecode.asyncmail.smtpserver.SMTPSession,
     *      com.googlecode.asyncmail.common.MailAddress,
     *      com.googlecode.asyncmail.common.MailAddress)
     */
    public HookResult doRcpt(SMTPSession session, MailAddress sender,
            MailAddress rcpt) {

        if (rcpt.getDomainPart().length() < minDomainLength) {
            logger.debug("Domain of recipient is to smaller then "
                    + minDomainLength + ". Reject email");
            return new HookResult(HookReturnCode.DENY, DSNStatus.getStatus(
                    DSNStatus.ADDRESS, DSNStatus.DELIVERY_INVALID_ARG),
                    "Recipient Domain is to smaller then the limit of "
                            + minDomainLength);
        }

        return new HookResult(HookReturnCode.DECLINED);
    }

}
